1_2021_sen_1

Title of the article REALIZATION OF TRACTION CAPABILITIES OF A TRACTOR WITH AN ELECTROMECHANICAL POWER TRAIN
Authors

ZHDANOVICH Cheslav I., Ph. D. in Eng., Assoc. Prof., Associate Professor of the Department “Tractors”, Belarusian National Technical University, Minsk, Republic of Belarus, This email address is being protected from spambots. You need JavaScript enabled to view it.">This email address is being protected from spambots. You need JavaScript enabled to view it.

KALININ Nikita V., Senior Researcher of the R&D Center “Agricultural Engineering”, Joint Institute of Mechanical Engineering of the NAS of Belarus, Minsk, Republic of Belarus, This email address is being protected from spambots. You need JavaScript enabled to view it.">This email address is being protected from spambots. You need JavaScript enabled to view it.
In the section MECHANICS OF MOBILE MACHINES
Year 2021
Issue 1
Pages 5–14
Type of article RAR
Index UDK 629.3.014
DOI https://doi.org/10.46864/1995-0470-2020-1-54-5-14
Abstract A method has been developed to assess the traction capabilities of a tractor with an electromechanical power train and determine the actual speed taking into account three restrictions: on the permissible slip of the tractor, the maximum power of the used internal combustion engine (ICE) and the permissible mode of operation of the traction induction motor (TIM). The developed mathematical model makes it possible to determine the drawbar pull and the actual speed of the tractor when regulating the TIM in the entire operating frequency range of the voltage supplied to the TIM for a comparative assessment of the traction capabilities of the tractor when using different gear ratios of the mechanical part of the power train (MPPT), as well as determine the slip and other parameters of the TIM when it works as a part of the electromechanical power train of the tractor. Calculations show that: 1) if the MPPT ratio is too high, the whole range of tractor operating speeds on the plowing will not be provided, and if the MPPT ratio is too low, the tractor will not be able to develop the maximum possible drawbar pull based on the permissible slip at any voltage frequency from the TIM control range without exceeding the nominal mode of operation of the TIM; 2) the higher the TIM gear ratio, the larger the section of the TIM frequency control range will be, in which the TIM will not be able to develop even the nominal slip due to the restriction on the permissible slip of the tractor, and for the same frequencies in this section, the TIM slip will be more limited at a higher MPPT gear ratio; the lower the transmission ratio of the MPPT, the more the nominal slip of the TIM will be exceeded during acceleration of the tractor with maintaining the maximum possible based on the permissible slip of the thrust force from the minimum speed to the speeds corresponding to plowing.
Keywords tractor, electromechanical power train, drawbar pull, slip, permissible slip, engine power, actual speed, current, voltage frequency
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